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Titanium and zirconium hard coatings on glass substrates prepared by the sol-gel method |
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| Authors: | Paolo Zurlini Ilaria Alfieri Angelo Montenero Nicola Senin |
| Affiliation: | a Dipartimento di Chimica G.I.A.F., Università degli Studi di Parma, viale Usberti 17/a, 43100 Parma, Italy b INSTM (Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali), via Giusti 9, 50121 Firenze, Italy c Dipartimento di Scienze Applicate ai Sistemi Complessi, Università Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy d Dipartimento di Ingegneria Industriale, Università degli Studi di Perugia, Via G. Duranti 67, 06125 Perugia, Italy e Dipartimento di Ingegneria Industriale, Università degli Studi di Parma, viale Usberti 181/a, 43100 Parma, Italy f Dipartimento di Ingegneria dei Materiali e dell'Ambiente, Università degli Studi di Modena e Reggio Emilia, Via Vignolese, 905 41100 Modena, Italy |
| Abstract: | In this work innovative antiscratch sol-gel coating films deposited on a soda-lime glass substrate are examined. Sol-gel coatings of different composition (TiO2, TiO2/B2O3, ZrO2 and ZrO2/B2O3) were prepared starting from Titanium, Zirconium and Boron alkoxides and from boron oxide. Coatings were obtained at room temperature and at atmospheric pressure by dip-coating using common soda lime silicate glass slides as substrates. Densification was carried out at 550 °C for 2 h in air. The morphology of the coatings has been studied by Atomic Force Microscopy, Scanning Electron Microscopy, and with a profilometer. Roughness grows with thickness and with boron addition. The mechanical properties of the films were evaluated by micro scratch at fixed and variable load. The scratch hardness numbers of ZrO2 and ZrO2/B2O3 coatings reach 6 GPa (glass value = 1.9 GPa), whereas the best value for the critical load is 16.7 N (glass value = 9 N). |
| Keywords: | Sol-gel deposition Hardness Surface morphology Zirconium oxide Titanium oxide Boron oxide |
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